The Camelbak Antidote Reservoir is a 1.5L (50oz) hydration bladder that gives you hands-free hydration. This bladder has an easy-fill cap that requires a single quarter turn to open and close, but still offers great leak protection. Simply fill it up and drink from the attached quick link tube and bite valve, allowing you to hydrate on the move. This durable bladder is easy to clean and well equipped for any adventure. Camelbak's patented Big Bite Valve is engineered with self-sealing silicone for a comfortable bite with no drips. HydroGuard technology inhibits the growth of bacteria on reservoir and tube surfaces.